Encode the letters A to Z as the numbers $11$ to $36,$ respectively. Set p $=541,$

q $=607$ and a $=227.$

$($a$)$ Use RSA with public key $($a$,$ pq$)$ to encrypt the message consisting of the first

two letters of your surname.$($in my case this is AH$)$

The two letters yield a single, $4-$digit block for encryption, not two $2-$digit

blocks. For example, if the first two letters of your family name is PA$,$ then

the $4-$digit block that you need to encrypt is $2611.)$

$($b$)$ Compute the private decryption key.

$($c$)$ Decrypt the encrypted message.